A two-phase three-field modeling framework for heat pipe application in nuclear reactors

• One-dimensional two-phase three-field flow model was developed for the analysis of heat pipes. Conservation equations droplet field were developed. Critical constitutive models and relations one-dimensional three-filed reviewed summarized. Applicable dimensionless parameters derived from pipe scaling analysis. Heat pipes thermosyphons are highly efficient transfer devices utilizing continuous evaporation condensation working fluid transport in closed systems. Because nearly isothermal fully passive phase-change mechanism, have found many applications nuclear engineering, space technologies, other energy High-temperature used microreactors to remove fission power primary system coupled with conversion systems or process applications. Modeling phenomena inside a is essential its design safety In this study, comprehensive has been normal operation conditions transients. The conservation mass, momentum, liquid film, vapor, droplet. addition, correlations thoroughly provided closure equations. Specific regarding interfacial mass at two interfaces, namely film-gas interface gas-droplet interface, entrainment deposition rates as well film rates. Additionally, mechanistic annular thickness recommended modeling without wick critical correlation. Furthermore, experimental data needs new experiments using prototype surrogate fluids validation high-temperature future research.